/Engine/Source/Runtime/MovieSceneCapture/Public/FrameGrabber.h
Called when the buffer is now available in CPU ram Return true if you would like to execute the default behavior. (If you return false, GetCapturedFrames will be empty).
virtual bool OnFrameReady_RenderThread ( [FColor](API\Runtime\Core\Math\FColor) * ColorBuffer, FIntPoint BufferSize, FIntPoint TargetSize ) const